Remove default terraform version

This is the safest way to ensure that we're using the correct version of
terraform when we're using utopia terraform

Includes an update on conftest

Dockerfile

@@ -29,11 +29,10 @@ ARG TARGETPLATFORM
 
 # install terraform binaries
 # renovate: datasource=github-releases depName=hashicorp/terraform versioning=hashicorp
-ENV DEFAULT_TERRAFORM_VERSION=1.4.6
 
 # In the official Atlantis image we only have the latest of each Terraform version.
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
-RUN AVAILABLE_TERRAFORM_VERSIONS="0.11.15 0.12.31 0.13.7 0.14.9 0.15.5 1.0.10 1.1.9 1.2.9 1.3.7 ${DEFAULT_TERRAFORM_VERSION}" && \
+RUN AVAILABLE_TERRAFORM_VERSIONS="0.11.15 0.12.31 0.13.7 0.14.9 0.15.5 1.0.10 1.1.9 1.2.9 1.3.7 1.4.6" && \
     case "${TARGETPLATFORM}" in \
         "linux/amd64") TERRAFORM_ARCH=amd64 ;; \
         "linux/arm64") TERRAFORM_ARCH=arm64 ;; \
@@ -49,11 +48,10 @@ RUN AVAILABLE_TERRAFORM_VERSIONS="0.11.15 0.12.31 0.13.7 0.14.9 0.15.5 1.0.10 1.
         ln -s "/usr/local/bin/tf/versions/${VERSION}/terraform" "/usr/local/bin/terraform${VERSION}" && \
         rm "terraform_${VERSION}_linux_${TERRAFORM_ARCH}.zip" && \
         rm "terraform_${VERSION}_SHA256SUMS"; \
-    done && \
-    ln -s "/usr/local/bin/tf/versions/${DEFAULT_TERRAFORM_VERSION}/terraform" /usr/local/bin/terraform
+    done
 
 # renovate: datasource=github-releases depName=open-policy-agent/conftest
-ENV DEFAULT_CONFTEST_VERSION=0.38.0
+ENV DEFAULT_CONFTEST_VERSION=0.42.1
 
 RUN AVAILABLE_CONFTEST_VERSIONS="${DEFAULT_CONFTEST_VERSION}" && \
     case "${TARGETPLATFORM}" in \